﻿var checkXMatrix = function (grid) {
    const n = grid.length;
    for (let i = 0; i < n; ++i) {
        for (let j = 0; j < n; ++j) {
            if (i === j || (i + j) === (n - 1)) {
                if (grid[i][j] === 0) {
                    return false;
                }
            } else if (grid[i][j] !== 0) {
                return false;
            }
        }
    }
    return true;
};
